import javax.swing.JComponent;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.geom.Ellipse2D;


public class TrafficLightComponent extends JComponent

{
   
public void paintComponent(Graphics g)
   
{
      
Graphics2D g2 = (Graphics2D) g;
     
 // your work here
       
g2.setColor(Color.RED);
     
g2.fillRoundRect(10,10,40,40,40,40);
      g2.setColor(Color.YELLOW);
      
g2.fillRoundRect(10,60,40,40,40,40);
      g2.setColor(Color.GREEN);
      
g2.fillRoundRect(10,110,40,40,40,40);
   
}

}